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Picosecond ultrasonic measurements using an optical cavity
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10.1063/1.3095470
/content/aip/journal/jap/105/8/10.1063/1.3095470
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/8/10.1063/1.3095470
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the optical cavity, formed from an external reflector placed in proximity and parallel to a reflecting test sample surface.

Image of FIG. 2.
FIG. 2.

The optical intensity reflectivity of the cavity as a function of the parameter defined in Eq. (6). The intensity reflectivity of the sample is 0.85. The curves are labeled by the values of the intensity reflectivity of the reflector .

Image of FIG. 3.
FIG. 3.

The change in the intensity reflectivity of the cavity due to a small change in the magnitude of the amplitude reflection coefficient of the sample as a function of the parameter . The intensity reflectivity of the sample is 0.85. The different curves are labeled by the values of the intensity reflection coefficient of the reflector .

Image of FIG. 4.
FIG. 4.

The gain in sensitivity due to an optical cavity as a function of the intensity reflection coefficient of the reflector. The cavity is assumed to be at resonance. The dashed curve is the overall intensity reflectivity coefficient of the structure. The intensity reflectivity of the sample is 0.85.

Image of FIG. 5.
FIG. 5.

The change in the reflectivity of a cavity with respect to the change in the parameter defined in Eq. (6). The different curves are labeled by the values of the intensity reflectivity of the reflector .

Image of FIG. 6.
FIG. 6.

Measured reflectivity of the optical cavity with the copper film as a function of the cavity spacing. Circles are measurements using the laser line filter to narrow the spectrum of the probe light, and the squares are without using the filter.

Image of FIG. 7.
FIG. 7.

Measured reflectivity of the pump (circles) and probe light (squares) for the optical cavity with the aluminum film.

Image of FIG. 8.
FIG. 8.

(a) The change in the reflectivity of the Al film as a function of time after the application of the pump light pulse in a “standard” picosecond ultrasonic experiment. (b) Results obtained for the same film when the cavity is used. Note especially the change in vertical scale.

Image of FIG. 9.
FIG. 9.

Measured values of for the aluminum film as a function of the probe delay time when the optical cavity is used. The different curves are data for a sequence of measurements with increasing cavity spacing. A smoothly varying background contribution has been subtracted from each data set.

Image of FIG. 10.
FIG. 10.

The open circles show the strain of the first returning acoustic pulse in the aluminum sample without using the cavity. The shape is determined through the analysis based on Eqs. (17)–(23). The solid curve is the result of the calculation based on Eqs. (24)–(29).

Image of FIG. 11.
FIG. 11.

The open squares show the shape of the first acoustic echo in the aluminum film when measured without using the cavity. The solid curve is the result of the fit based on Eqs. (17)–(23).

Image of FIG. 12.
FIG. 12.

The open squares show the shape of the first acoustic echo in the aluminum film when measured using the cavity. The solid curve is the result of the fit based on Eqs. (17)–(23). The dashed and dotted curves show the contributions from the displacement of the film surface and the piezo-optic effect, respectively.

Image of FIG. 13.
FIG. 13.

for the copper film when measured using the optical cavity. The solid line shows the experimental data after background subtraction of a constant plus a decaying exponential. The dotted and dashed curves show the value of calculated from Eq. (31) using values of of 100 and , respectively.

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/content/aip/journal/jap/105/8/10.1063/1.3095470
2009-04-20
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Picosecond ultrasonic measurements using an optical cavity
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/8/10.1063/1.3095470
10.1063/1.3095470
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